linux-kernel - Re: [PATCH] mm/memory-failure: teach kill_accessing

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Message-Id: <20251220151301.b0ec3c1aa6527b0b1bca1e4c@linux-foundation.org>
Date: Sat, 20 Dec 2025 15:13:01 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Jane Chu <jane.chu@...cle.com>
Cc: muchun.song@...ux.dev, osalvador@...e.de, david@...nel.org,
 linmiaohe@...wei.com, jiaqiyan@...gle.com, william.roche@...cle.com,
 rientjes@...gle.com, lorenzo.stoakes@...cle.com, Liam.Howlett@...cle.com,
 rppt@...nel.org, surenb@...gle.com, mhocko@...e.com, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/memory-failure: teach kill_accessing_process to
 accept hugetlb tail page pfn

On Thu, 18 Dec 2025 23:28:19 -0700 Jane Chu <jane.chu@...cle.com> wrote:

> When a hugetlb folio is being poisoned again, try_memory_failure_hugetlb()
> passed head pfn to kill_accessing_process(), that is not right.
> The precise pfn of the poisoned page should be used in order to
> determine the precise vaddr as the SIGBUS payload.
> 
> This issue has already been taken care of in the normal path, that is,
> hwpoison_user_mappings(), see [1][2].  Further more, for [3] to work
> correctly in the hugetlb repoisoning case, it's essential to inform
> VM the precise poisoned page, not the head page.

This conflicts with your "mm/memory-failure: fix missing ->mf_stats
count in hugetlb poison".

Also conflicts a bit with "mm: fixup pfnmap memory failure handling to
use pgoff" but that one isn't cc:stable, so this patch (which *is*
cc:stable) takes priority.

Help?